Wikipedia:Manual of Style/Character Table 1

Characters to avoid |
Avoid	Instead use	Note
… (…)	... (i.e. 3 periods)	See MOS:ELLIPSIS.
Unicode Roman numerals like Ⅰ Ⅱ ⅰ ⅱ	Latin letters equivalent (I II i ii)
Unicode fractions like ¼ ½ ¾ ⁄	{{frac}}, {{sfrac}}	See MOS:FRAC.
Unicode subscripts and superscripts like ¹ ⁺ ⁿ ₁ ₊ ₙ	<sup></sup> <sub></sub>	See WP:SUPSCRIPT.
µ (&micro;)	μ (&mu;)	See MOS:NUM#Specific units
Ligatures like Æ æ Œ œ	Separate letters (AE ae OE oe)	Generally avoid except in proper names and text in languages in which they are standard. See MOS:LIGATURES.
∑ (&sum;) ∏ (&#8719;) ― (&horbar;)	Σ (&Sigma;) Π (&Pi;) — (&mdash;)
‘ (&lsquo;) ’ (&rsquo;) ‚ (&sbquo;) “ (&ldquo;) ” (&rdquo;) „ (&bdquo;) ´ (&acute;) ′ (&prime;) ″ (&Prime;) ` (&#96;)	Straight quotes (" and ')	These characters are used in math notation; elsewhere use straight quotes. See MOS:QUOTEMARKS.
&ensp; &emsp; &thinsp; &hairsp;	Normal space	These are sometimes used for precision positioning in templates but rarely in prose, where non-breaking &nbsp; and regular space are normally sufficient.
In vertical lists • (&bull;) · (&middot;) ⋅ (&sdot;)	*	Proper wiki markup should be used to create vertical lists. See HELP:LIST#List basics.
&zwj; &zwnj;	see note	Used in certain foreign-language words, see zero-width joiner/zero-width non-joiner. Should be avoided elsewhere.